Microsoft will make generally available its latest release of its Dynamics NAV ERP product later this month.
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Keeping up with the Microsoft Dynamics CRM codenames
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Microsoft announced on October 7 that Dynamics NAV 2013 R2 will be generally available in October 2013.
Update: Another Microsoft blog post claims that Dynamics NAV 2013 R2 is generally available as of today, October 7. And this post also says NAV 2013 R2 has shipped and is available for download.
Dynamics NAV is one of four different ERP suites that Microsoft offers; NAV is focused largely on the small/midsize business market.